Hard coating film, material coated with hard coating film, and die for cold plastic working

Abstract

Disclosed herein are a hard coating film, a material coated with the hard coating film, and a die for cold plastic working, the coating film excelling conventional surface coating layers in wear resistance as well as slidability with a low frictional coefficient. The hard coating film is characterized by a chemical composition of (V x M 1-x ) (B a C b N 1-a-b ), where 0.4≦ x ≦0.95  (1A) 0≦ a ≦0.2  (2A) 0≦1- a - b ≦0.35  (3A) 0.6≦ b ≦1  (4A) M denotes at least one species of elements belonging to Groups 4a, 5a, and 6a and Si and Al; and x, 1-x, a, b, and 1-a-b represent respectively the atomic ratio of V, M, B, C, and N.

1. A hard coating film characterized by a chemical composition of (V x M 1-x )(B a C b N 1-a-b ), where
   0.4 ≦x ≦0.95  (1A)
 
   0 ≦a ≦0.2  (2A)
 
   0<1− a−b ≦0.2  (3A)
 
   0.8 ≦b <1  (4A)
 
 M denotes at least one species of elements belonging to Groups 4a, 5a, and 6a and Si and Al; and x, 1−x, a, b, and 1−a−b represent respectively the atomic ratio of V, M, B, C, and N. 
 
     
     
       2. A material coated with hard coating film which comprises a substrate and a hard coating film formed on the surface thereof, said hard coating film being the one defined in  claim 1 . 
     
     
       3. A die for cold plastic working made of the material coated with hard coating film as defined in  claim 2 . 
     
     
       4. A material coated with hard coating film which comprises a substrate consisting of ferrous alloy, a first layer of hard coating film formed on the surface of the substrate, and a second layer of hard coating film formed on the first layer, said first layer of hard coating film being a nitride of at least one species of Cr, Ti, Al, and Si, and said second layer of hard coating film being the one defined in  claim 1 . 
     
     
       5. The hard coating film according to  claim 1 , where
   0.4 ≦x ≦0.95  (1A)
 
   0 <a ≦0.2  (2A)
 
   0<1− a−b≦ 0.2  (3A)
 
   0.8≦ b< 1  (4A)
 
 M denotes at least one species of elements belonging to Groups 4a, 5a, and 6a and Si and Al; and x, 1−x, a, b, and 1−a−b represent respectively the atomic ratio of V, M, B, C, and N. 
 
     
     
       6. A hard coating film characterized by a chemical composition of (V x Ti 1-x-y M y )(C b N 1-b ), where
   0.4 ≦x ≦0.95  (1B)
 
   0 ≦y ≦0.15  (2B)
 
   0.9 ≦b <1  (3B)
 
 M denotes at least one species of elements (other than Ti) belonging to Groups 4a, 5a, and 6a and Si and Al; and x, 1−x−y, y, b, and 1−b represent respectively the atomic ratio of V, Ti, M, C, and N. 
 
     
     
       7. A material coated with hard coating film which comprises a substrate and a hard coating film formed on the surface thereof, said hard coating film being the one defined in  claim 6 . 
     
     
       8. A die for cold plastic working made of the material coated with hard coating film as defined in  claim 7 . 
     
     
       9. A material coated with hard coating film which comprises a substrate consisting of ferrous alloy, a first layer of hard coating film formed on the surface of the substrate, and a second layer of hard coating film formed on the first layer, said first layer of hard coating film being a nitride of at least one species of Cr, Ti, Al, and Si, and said second layer of hard coating film being the one defined in  claim 6 . 
     
     
       10. The hard coating film according to  claim 6 , where
   0.4 ≦x ≦0.95  (1B)
 
   0 <y ≦0.15  (2B)
 
   0.9≦ b <1  (3B)
 
 M denotes at least one species of elements (other than Ti) belonging to Groups 4a, 5a, and 6a and Si and Al; and x, 1−x−y, y, b, and 1−b represent respectively the atomic ratio of V, Ti, M, C, and N. 
 
     
     
       11. A hard coating film which comprises one or more layers of coating film A and one or more layers of coating film B wherein
 Coating film A, has a chemical composition of V(B a C b N 1-a-b ), where
   0 ≦a ≦0.2  (1C)
 
   0<1 −a−b ≦0.35  (2C)
 
   0.6≦ b< 1  (3C)
 
 
 
       a, b, and 1−a−b represent respectively the atomic ratio of B, C, and N, and wherein Coating film B has a chemical composition of M(B a C b N 1-a-b ), where
   0 ≦a ≦0.2  (1D)
 
   0≦1− a−b ≦0.2  (2D)
 
   0.8≦ b≦ 1  (3D)
 
 M denotes at least one species of elements belonging to Groups 4a, 5a, and 6a and Si and Al; and a, b, and 1−a−b represent respectively the atomic ratio of B, C, and N. 
 
     
     
       12. A material coated with hard coating film which comprises a substrate and a hard coating film formed on the surface thereof, said hard coating film being the one defined in  claim 11 . 
     
     
       13. A die for cold plastic working made of the material coated with hard coating film as defined in  claim 12 . 
     
     
       14. A material coated with hard coating film which comprises a substrate consisting of ferrous alloy, a first layer of hard coating film formed on the surface of the substrate, and a second layer of hard coating film formed on the first layer, said first layer of hard coating film being a nitride of at least one species of Cr, Ti, Al, and Si, and said second layer of hard coating film being the one defined in  claim 11 . 
     
     
       15. The hard coating film according to  claim 11 , wherein Coating film A has a chemical composition of V(B a C b N 1-a-b ), where
   0< a ≦0.2  (1C)
 
   0<1− a−b 0.35  (2C)
 
   0.6 ≦b <1  (3C)
 
 
       a, b, and 1−a−b represent respectively the atomic ratio of B, C, and N, and wherein Coating film B has a chemical composition of M(B a C b N 1-a-b ), where
   0 <a ≦0.2  (1D)
 
   0<1− a−b ≦0.2  (2D)
 
   0.8≦ b≦ 1  (3D)
 
 M denotes at least one species of elements belonging to Groups 4a, 5a, and 6a and Si and Al; and a, b, and 1−a−b represent respectively the atomic ratio of B, C, and N.